Аннотация
A hereditary property of graphs is a collection of graphs which is closed
under taking induced subgraphs. The speed of \P is the function n \mapsto
|\P_n|, where \P_n denotes the graphs of order n in \P. It was shown by
Alekseev, and by Bollobas and Thomason, that if \P is a hereditary property of
graphs then |\P_n| = 2^(1 - 1/r + o(1))n^2/2, where r = r(\P) \N is the
so-called `colouring number' of \P. However, their results tell us very little
about the structure of a typical graph G \P.
In this paper we describe the structure of almost every graph in a hereditary
property of graphs, \P. As a consequence, we derive essentially optimal bounds
on the speed of \P, improving the Alekseev-Bollobas-Thomason Theorem, and also
generalizing results of Balogh, Bollobas and Simonovits.
Пользователи данного ресурса
Пожалуйста,
войдите в систему, чтобы принять участие в дискуссии (добавить собственные рецензию, или комментарий)